Usually translate5 uses the standard mail server, that is configured via php.ini, which usually goes through sendmail on Linux.
Yet it is possible to configure any mail server to use for a certain translate5 installation through smtp in translate5's installation.ini.
To do so you can use a configuration like this:
resources.mail.defaultFrom.email = service@translationcompany.com ;this is the address that is the sender of the email resources.mail.defaultFrom.name = "Translation Company" ;this is just hte from name for the email resources.mail.transport.type = Zend_Mail_Transport_Smtp ;this is the mail transport type for the Zend_Mail class and should stay as it is for smtp resources.mail.transport.host = your.smtphost.com ;this should be the hostname of your smtp server, that should send the mail resources.mail.transport.name = translate5.translationcompany.com ;this should be the domain name of the server, that runs translate5
To send every mail the server sends as bcc to certain addresses you can add the following lines
runtimeOptions.mail.generalBcc[] = support@translationcompany.com
runtimeOptions.mail.generalBcc[] = support2@translationcompany.com